remove obsolete comment about "mysql.he.net"

Author: J0WI

5.5/Dockerfile

@@ -32,7 +32,6 @@ RUN apt-get update && apt-get install -y libaio1 pwgen && rm -rf /var/lib/apt/li
 ENV MYSQL_MAJOR 5.5
 ENV MYSQL_VERSION 5.5.52
 
-# note: we're pulling the *.asc file from mysql.he.net instead of dev.mysql.com because the official mirror 404s that file for whatever reason - maybe it's at a different path?
 RUN apt-get update && apt-get install -y ca-certificates wget --no-install-recommends && rm -rf /var/lib/apt/lists/* \
 	&& wget "https://cdn.mysql.com/Downloads/MySQL-$MYSQL_MAJOR/mysql-$MYSQL_VERSION-linux2.6-x86_64.tar.gz" -O mysql.tar.gz \
 	&& wget "https://cdn.mysql.com/Downloads/MySQL-$MYSQL_MAJOR/mysql-$MYSQL_VERSION-linux2.6-x86_64.tar.gz.asc" -O mysql.tar.gz.asc \